Yeah, I have two Crumpler bags which are awesome (a shoulder bag for when I just take my laptop and a backpack for when I have books too). I think they're some of the best made laptop bags, but pricey.
My current laptop is 4.38 lbs which I love. Though I still remember when I bought my first laptop, some 7 or so years ago, I think it was nearly 9 lbs!